Wwise SDK 2021.1.8
Removes the specified source from the list of loaded media, only if this media is not already in use. The sources are identified by their ID (refer to General Information for a discussion on using strings and IDs).
If out_pUnsetResults is not null, then it is assumed to point to an array of result codes of the same length as in_pSourceSettings. out_pUnsetResults will be filled with either AK_Success or AK_ResourceInUse, indicating which media was still in use and not unset.